Morpho butterfly nanostructure inspires technology for bright, balanced lighting

 https://phys.org/news/2023-10-morpho-butterfly-nanostructure-technology-bright.html

"cheap, water-repelling, high transmittance >93%... Morpho butterflies randomly arranged multilayer enables selective reflection blue light over ≥±40° angle from illumination direction... range of colors without dispersion, self-clean simple water rinse, shaped with standard nanofabrication tools... 2D nanopatterns transparent polydimethylsiloxane elastomer... llight diffusion controlled into anisotropic shape: 78° x- and 16° y-direction... daylight-harvesting windows, visual displays, optical diffusers"